Worm:Win32/Renocide.U is a worm - a self-propagating program that can spread itself from one computer to another. Worms may spread themselves via a variety of different channels in order to compromise new computers. Commonly, worms may spread directly by copying themselves to removable or network drives, or by attempting to exploit particular vulnerabilities on targeted computers. Worms also often attempt to spread via platforms that require user interaction in order to run. They may send themselves as an attachment to an email or an instant message, or send a link to a copy of themselves in the body of a message. In these cases the message needs to be convincing enough to encourage the victim to click on the link or attachment and run or download a copy of the worm.
Installation
When executed, Worm:Win32/Renocide.U copies itself to <system folder>\csrcs.exe.
Note: <system folder> refers to a variable location that is determined by the malware by querying the Operating System. The default installation location for the System folder for Windows 2000 and NT is C:\Winnt\System32; and for XP, Vista, and 7 is C:\Windows\System32.
The malware modifies the following registry entries to ensure that its copy executes at each Windows start:
Adds value: "Shell"
With data: "explorer.exe csrcs.exe"
To subkey: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
Adds value: "csrcs"
With data: "c:\windows\system32\csrcs.exe"
To subkey: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
The malware
creates files on an affected computer using variable file names, for example:- c:\documents and settings\administrator\local settings\temp\drmagwv
- c:\documents and settings\administrator\local settings\temp\lbgwkmz
The malware creates the following files on an affected computer:
-
<system folder>\autorun.inf
-
c:\documents and settings\administrator\local settings\temp\~ip.tmp
-
c:\documents and settings\administrator\local settings\temp\aute.tmp
-
c:\documents and settings\administrator\local settings\temp\autf.tmp
-
c:\documents and settings\administrator\local settings\temp\suicide.bat
Payload
Modifies system settings
Worm:Win32/Renocide.U overrides the display settings so files with the 'hidden' attribute are not displayed; it does this by making the following registry modification:
Adds value:
"Hidden" With data:
"2"To subkey:
HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
Contacts remote hosts
The malware may contact the following remote hosts:
- flix.flufi403ss.com using port 3565
- mosceyxh.dip.jp using port -26992
- utic.c0afdone.com using port -16323
- www.whatismyip.com using port 80
Commonly, malware may contact a remote host for the following purposes:
- To confirm Internet connectivity
- To report a new infection to its author
- To receive configuration or other data
- To download and execute arbitrary files (including updates or additional malware)
- To receive instruction from a remote attacker
- To upload data taken from the affected computer
This malware description was produced and published using our automated analysis system's examination of file SHA1 0633b1f172e1f06e4b3dd229c94e1199ae78a46c.